SQL Server Plan Cache 計數器描述 Cache Hit Ratio快取叫用數和查閱數之間的比率 Cache Hit Ratio Base僅供內部使用。 Cache Object Counts快取中的快取物件數。 Cache Objects in use使用中的快取物件數目。 快取頁面快取物件所用的 8 KB 分頁數。
Plan cache is searched for possible plan reuse opportunities. If a plan reuse for a batch happens, its compilation costs are avoided. Note that in the SQL Server literature, the word "procedure cache" has been used to describe what is called "plan cache" in this paper. "Plan cache" is ...
SQL Server Plan Cache 对象 Plan Cache 对象提供用于监视SQL Server 如何使用内存来存储对象(例如存储过程、即席和准备的Transact-SQL语句以及触发器)的计数器。可同时监视 Plan Cache 对象的多个实例,每个实例代表一个要监视的不同类型的计划。 下表介绍了 SQLServer:Plan Cache计数器。 对象中的每个计数器均包含以...
WHEREtypeIN('CACHESTORE_SQLCP','CACHESTORE_OBJCP') GROUPBYtype; GO 在SQL Server 2008之前的版本,内部内存压力上限很少触发。因为在哈希表中的项数量总是被缓存存储中的计划的大小初始化。然而,在SQL Server 2008中,如果你启用Ad Hoc workloads优化,SQL Server 缓存存储中的实际项可能非常小(每一个已编译计划...
Compiled plans are stored into a part of SQL Server's memory calledplan cache. Plan cache is searched for possible plan reuse opportunities. If a plan reuse for a batch happens, its compilation costs are avoided. Note that in the SQL Server literature, the word "procedure cache" has been ...
It’s important to understand that the plan cache in SQL Server 2005 is not actually a separate area of memory. Releases prior to SQL Server 7 had two effective configuration values to control the size of the plan cache, which was then called the procedure cache. One specified a fixed size...
计划缓存元数据(Plan Cache Metadata) 句柄(handle) sys.dm_exec_cached_plans视图为每个已编译计划包含一个值plan_handle。Plan_Handle是SQL Server从完整的编译计划中提取出的一个哈希值,它对当前的每一个已存在的编译计划是惟一的,可以被多次重用,可以被看作已编译计划的标识。如果批处理中的某个独立的语句被重...
Plan Guide Effect on the Plan Cache Related Tasks See Also Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric Important Query Store hints provide an easier-to-use method for shaping query plans without changing application code. Query Store ...
p.usecounts, p.cacheobjtype , p.objtype, p.size_in_bytes , t.[text] , qp.query_plan FROM sys.dm_exec_cached_plans p CROSS APPLY sys.dm_exec_sql_text(p.plan_handle) t CROSS APPLY sys.dm_exec_query_plan(p.plan_handle) AS qp ...
10.0 Plan Cache FlushArticle 01/17/2007 In SQL Server 2005, certain database maintenance operations or certain dbcc commands such as “dbcc freeproccache” or “dbcc freesystemcache” will clear the plan cache for the instance of SQL Server. Clearing the plan cache causes a recompilation of ...